Device and method for injecting fuel into an engine, assisted by compressed air or gas

Abstract

A device and method are provided for the pneumatic injection of fuel into an engine. The device comprises at least one auxiliary duct having two ends one of which is connected to an exhaust pipe and the other to an injection member.

What is claimed is: 
     
       1. A method for effecting an injection of fuel in an internal combustion engine, the internal combustion engine including a pneumatic injection member and an exhaust pipe, the method comprising the steps of establishing a communication between the exhaust pipe and the injection member, communicating the communication between the exhaust pipe and the injection member with a gas source via an obstruction member including one of a stop valve or a check valve. 
     
     
       2. A method as claimed in claim 1, applied to an engine comprising at least two cylinders, each of said cylinders comprising an exhaust pipe and an injection member, the method further comprising the steps of establishing a cross communication by connecting the exhaust pipe of one of the cylinders to the injection member of the other cylinder. 
     
     
       3. A method according to claim 1, wherein the step of communicating to communication between the exhaust pipe and the injection member includes providing a second stop valve or check valve for controlling the communication. 
     
     
       4. A method according to claim 1, wherein the internal combustion engine is a two stroke engine, further comprising the step of introducing air into a cylinder of the internal combustion engine through a transfer means communicating with a sealed crank case of the engine.